The Effect of the Limited Aperture of an Emitter on the Width and Divergence Angle of a Laser Beam


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The conditions necessary for the correct measurement of the width and divergence angle of a laser beam have been determined with consideration for the finite dimensions of the aperture of an emitter by the method based on the estimation of initial spatial moments. It has been shown that the severe requirements disregarded in the corresponding developed standards are imposed on the shape of the spatial intensity distribution in a laser beam cross section in this case.

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A. Raitsin

All-Russian Research Institute for Optical and Physical Measurements

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